![Las Vegas slot machines](https://upload.wikimedia.org/wikipedia/commons/8/82/Las_Vegas_slot_machines.jpg)
A slot machine (
American English
American English, sometimes called United States English or U.S. English, is the set of variety (linguistics), varieties of the English language native to the United States. English is the Languages of the United States, most widely spoken lan ...
), fruit machine (
British English
British English (BrE, en-GB, or BE) is, according to Lexico, Oxford Dictionaries, "English language, English as used in Great Britain, as distinct from that used elsewhere". More narrowly, it can refer specifically to the English language in ...
) or poker machine (
Australian English
Australian English (AusE, AusEng, AuE, AuEng, en-AU) is the set of varieties of the English language native to Australia. It is the country's common language and ''de facto'' national language; while Australia has no official language, Engli ...
and
New Zealand English) is a
gambling
Gambling (also known as betting or gaming) is the wagering of something of value ("the stakes") on a random event with the intent of winning something else of value, where instances of strategy are discounted. Gambling thus requires three el ...
machine that creates a
game of chance
A game of chance is in contrast with a game of skill. It is a game whose outcome is strongly influenced by some randomizing device. Common devices used include dice, spinning tops, playing cards, roulette wheels, or numbered balls drawn from a ...
for its customers. Slot machines are also known pejoratively as one-armed bandits because of the large mechanical
lever
A lever is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge, or '' fulcrum''. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, load and effort, the lever is d ...
s affixed to the sides of early mechanical machines and the games' ability to empty players' pockets and wallets as thieves would.
A slot machine's standard layout features a screen displaying three or more reels that "spin" when the game is activated. Some modern slot machines still include a lever as a
skeuomorphic design trait to trigger play. However, the mechanics of early machines have been superseded by
random number generators
Random number generation is a process by which, often by means of a random number generator (RNG), a sequence of numbers or symbols that cannot be reasonably predicted better than by random chance is generated. This means that the particular ou ...
, and most are now operated using buttons and
touchscreen
A touchscreen or touch screen is the assembly of both an input ('touch panel') and output ('display') device. The touch panel is normally layered on the top of an electronic visual display of an information processing system. The display is ofte ...
s.
Slot machines include one or more
currency detector
A currency detector or currency validator is a device that determines whether notes or coins are genuine or counterfeit. These devices are used in a wide range of automated machines, such as retail kiosks, supermarket self checkout machines, ...
s that validate the form of payment, whether
coin
A coin is a small, flat (usually depending on the country or value), round piece of metal or plastic used primarily as a medium of exchange or legal tender. They are standardized in weight, and produced in large quantities at a mint in order t ...
,
cash
In economics, cash is money in the physical form of currency, such as banknotes and coins.
In bookkeeping and financial accounting, cash is current assets comprising currency or currency equivalents that can be accessed immediately or near-im ...
,
voucher
A voucher is a bond of the redeemable transaction type which is worth a certain monetary value and which may be spent only for specific reasons or on specific goods. Examples include housing, travel, and food vouchers. The term voucher is also ...
, or
token. The machine pays out according to the pattern of symbols displayed when the reels stop "spinning". Slot machines are the most popular gambling method in
casino
A casino is a facility for certain types of gambling. Casinos are often built near or combined with hotels, resorts, restaurants, retail shopping, cruise ships, and other tourist attractions. Some casinos are also known for hosting live entertai ...
s and constitute about 70% of the average U.S. casino's income.
Digital technology has resulted in variations in the original slot machine concept. As the player is essentially playing a
video game
Video games, also known as computer games, are electronic games that involves interaction with a user interface or input device such as a joystick, controller, keyboard, or motion sensing device to generate visual feedback. This fee ...
, manufacturers can offer more interactive elements, such as advanced bonus rounds and more varied video graphics.
Etymology
The "slot machine" term derives from the slots on the machine for inserting and retrieving coins. "Fruit machine" comes from the traditional fruit images on the spinning reels such as lemons and cherries.
History
![Liberty Bell slot machine 2012-09-15 16-50-38](https://upload.wikimedia.org/wikipedia/commons/a/a4/Liberty_Bell_slot_machine_2012-09-15_16-50-38.jpg)
Sittman and Pitt of
Brooklyn
Brooklyn () is a borough of New York City, coextensive with Kings County, in the U.S. state of New York. Kings County is the most populous county in the State of New York, and the second-most densely populated county in the United States, be ...
,
New York developed a gambling machine in 1891 that was a precursor to the modern slot machine. It contained five drums holding a total of 50 card faces and was based on
poker. The machine proved extremely popular, and soon many
bars in the city had one or more of them. Players would insert a
nickel
Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel is a hard and ductile transition metal. Pure nickel is chemically reactive but large pieces are slow ...
and pull a lever, which would spin the drums and the cards that they held, the player hoping for a good poker hand. There was no direct payout mechanism, so a
pair of kings
''Pair of Kings'' is an American television sitcom that originally aired on the cable channel Disney XD from September 10, 2010 to February 18, 2013. It premiered September 10, 2010 on Disney Channel and September 22, 2010 on Disney XD. The si ...
might get the player a free beer, whereas a
royal flush could pay out cigars or drinks; the prizes were wholly dependent upon what the establishment would offer. To improve the odds for the house, two cards were typically removed from the
deck, the ten of
spades and the
jack of hearts
The jack of hearts is a playing card in the standard 52-card deck.
Jack of Hearts may also refer to:
* Jack of Hearts (Marvel Comics) (Jack Hart), a fictional superhero appearing in Marvel Comics
* Jack of Hearts, a member of the Royal Flush Ga ...
, doubling the
odds
Odds provide a measure of the likelihood of a particular outcome. They are calculated as the ratio of the number of events that produce that outcome to the number that do not. Odds are commonly used in gambling and statistics.
Odds also have ...
against winning a royal flush. The drums could also be rearranged to further reduce a player's chance of winning.
Because of the vast number of possible wins in the original poker-based game, it proved practically impossible to make a machine capable of awarding an automatic payout for all possible winning combinations. At some time between 1887 and 1895,
Charles Fey
Charles Fey (born August Fey in Vöhringen, Bavaria; September 9, 1862 – November 10, 1944) was a San Francisco mechanic best known for inventing the slot machine.
Career and invention
His father Karl worked as a sexton at the Ulm Minster ...
of
San Francisco
San Francisco (; Spanish language, Spanish for "Francis of Assisi, Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the List of Ca ...
, California devised a much simpler automatic mechanism with three spinning reels containing a total of five symbols:
horseshoes,
diamonds
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic. Another solid form of carbon known as graphite is the chemically stable form of carbon at room temperature and pressure, bu ...
, spades,
hearts and a
Liberty Bell; the bell gave the machine its name. By replacing ten cards with five symbols and using three reels instead of five drums, the complexity of reading a win was considerably reduced, allowing Fey to design an effective automatic payout mechanism. Three bells in a row produced the biggest payoff, ten nickels (50¢). Liberty Bell was a huge success and spawned a thriving mechanical gaming device industry. After a few years, the devices were banned in California, but Fey still could not keep up with the demand for them from elsewhere. The Liberty Bell machine was so popular that it was copied by many slot machine manufacturers. The first of these, also called the "Liberty Bell", was produced by the manufacturer Herbert Mills in 1907. By 1908, many "bell" machines had been installed in most cigar stores, saloons, bowling alleys, brothels and barber shops. Early machines, including an 1899 Liberty Bell, are now part of the Nevada State Museum's Fey Collection.
The first Liberty Bell machines produced by
Mills
Mills is the plural form of mill, but may also refer to:
As a name
* Mills (surname), a common family name of English or Gaelic origin
* Mills (given name)
*Mills, a fictional British secret agent in a trilogy by writer Manning O'Brine
Places Uni ...
used the same symbols on the reels as did Charles Fey's original. Soon afterward, another version was produced with patriotic symbols, such as
flags and
wreath
A wreath () is an assortment of flowers, leaves, fruits, twigs, or various materials that is constructed to form a circle .
In English-speaking countries, wreaths are used typically as household ornaments, most commonly as an Advent and Chri ...
s, on the wheels. Later, a similar machine called the Operator's Bell was produced that included the option of adding a
gum-vending attachment. As the gum offered was fruit-flavored, fruit symbols were placed on the reels:
lemon
The lemon (''Citrus limon'') is a species of small evergreen trees in the flowering plant family Rutaceae, native to Asia, primarily Northeast India (Assam), Northern Myanmar or China.
The tree's ellipsoidal yellow fruit is used for culin ...
s,
cherries,
oranges
An orange is a fruit of various citrus species in the family Rutaceae (see list of plants known as orange); it primarily refers to ''Citrus'' × ''sinensis'', which is also called sweet orange, to distinguish it from the related ''Citrus × ...
and
plums. A bell was retained, and a picture of a stick of Bell-Fruit Gum, the origin of the bar symbol, was also present. This set of symbols proved highly popular and was used by other companies that began to make their own slot machines:
Caille, Watling,
Jennings
Jennings is a surname of early medieval English origin (also the Anglicised version of the Irish surnames Mac Sheóinín or MacJonin). Notable people with the surname include:
*Jennings (Swedish noble family)
A–G
*Adam Jennings (born 1982), A ...
and Pace.
A commonly used technique to avoid gambling laws in several states was to award food prizes. For this reason, several
gumball and other
vending machine
A vending machine is an automated machine that provides items such as snacks, beverages, cigarettes, and lottery tickets to consumers after cash, a credit card, or other forms of payment are inserted into the machine or otherwise made. The fir ...
s were regarded with mistrust by the courts. The two
Iowa
Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to the ...
cases of ''State v. Ellis'' and ''State v. Striggles'' are both used in
criminal law classes to illustrate the concept of reliance upon authority as it relates to the axiomatic ''
ignorantia juris non excusat
In law, (Latin for "ignorance of the law excuses not"),'' Black's Law Dictionary'', 5th Edition, pg. 672 or ("ignorance of law excuses no one"),'' Black's Law Dictionary'', 5th Edition, pg. 673 is a legal principle holding that a person who is u ...
'' ("ignorance of the law is no excuse"). In these cases, a
mint
MiNT is Now TOS (MiNT) is a free software alternative operating system kernel for the Atari ST system and its successors. It is a multi-tasking alternative to TOS and MagiC. Together with the free system components fVDI device drivers, XaA ...
vending machine was declared to be a gambling device because the machine would, by internally manufactured chance, occasionally give the next user several tokens exchangeable for more candy. Despite the display of the result of the next use on the machine, the courts ruled that "
e machine appealed to the player's propensity to gamble, and that is
vice."
In 1963,
Bally
Bally may refer to:
Places
*Bally, a historical spelling of Bali
*Bally (from the Irish ''baile'') or townland, a traditional division of land, as well as a common prefix in the names of settlements throughout Ireland
*Bally, Bally-Jagachha, a c ...
developed the first fully electromechanical slot machine called Money Honey (although earlier machines such as Bally's High Hand draw-poker machine had exhibited the basics of electromechanical construction as early as 1940). Its electromechanical workings made Money Honey the first slot machine with a bottomless hopper and automatic payout of up to 500 coins without the help of an attendant. The popularity of this machine led to the increasing predominance of
electronic game
An electronic game is a game that uses electronics to create an interactive system with which a player can play. Video games are the most common form today, and for this reason the two terms are often used interchangeably. There are other common ...
s, with the side lever soon becoming vestigial.
The first video slot machine was developed in 1976 in
Kearny Mesa, California by the Las Vegas–based Fortune Coin Co. This machine used a modified
Sony Trinitron color receiver for the display and logic boards for all slot-machine functions. The prototype was mounted in a full-size, show-ready slot-machine cabinet. The first production units went on trial at the
Las Vegas Hilton Hotel
The Westgate Las Vegas Resort & Casino is a hotel, casino, and timeshare resort in Winchester, Nevada. Located near the northern end of the Las Vegas Strip, it is owned by Westgate Resorts. It opened in 1969 as the International Hotel, and was ...
. After some modifications to defeat cheating attempts, the video slot machine was approved by the Nevada State Gaming Commission and eventually found popularity on the
Las Vegas Strip
The Las Vegas Strip is a stretch of Las Vegas Boulevard, Las Vegas Boulevard South in Clark County, Nevada, that is known for its concentration of resort hotels and casinos. The Strip, as it is known, is about long, and is immediately south of ...
and in downtown casinos. Fortune Coin Co. and its video slot-machine technology were purchased by
IGT (International Gaming Technology) in 1978.
The first American video slot machine to offer a "second screen" bonus round was Reel ’Em In, developed by
WMS Industries
WMS Industries, Inc. was an American electronic gaming and amusement manufacturer in Enterprise, Nevada. It was merged into Scientific Games in 2016. WMS's predecessor was the Williams Manufacturing Company, founded in 1943 by Harry E. Willia ...
in 1996. This type of machine had appeared in Australia from at least 1994 with the Three Bags Full game. With this type of machine, the display changes to provide a different game in which an additional payout may be awarded.
Operation
![RAY Ruusu and Tuplapotti](https://upload.wikimedia.org/wikipedia/commons/3/38/RAY_Ruusu_and_Tuplapotti.JPG)
Depending on the machine, the player can insert cash or, in "
ticket-in, ticket-out
Ticket-in, ticket-out (TITO) is a technology used in more modern slot machines. It was originally developed circa 1992 by MGM Corporation who purchased technology from a Las Vegas firm Five Star Solutions as well as barcode ticket printing technol ...
" machines, a paper ticket with a
barcode
A barcode or bar code is a method of representing data in a visual, machine-readable form. Initially, barcodes represented data by varying the widths, spacings and sizes of parallel lines. These barcodes, now commonly referred to as linear or o ...
, into a designated slot on the machine. The machine is then activated by means of a lever or button (either physical or on a touchscreen), which activates reels that spin and stop to rearrange the symbols. If a player matches a winning combination of symbols, the player earns credits based on the paytable. Symbols vary depending on the theme of the machine. Classic symbols include objects such as fruits, bells, and stylized
lucky sevens. Most slot games have a theme, such as a specific
aesthetic
Aesthetics, or esthetics, is a branch of philosophy that deals with the nature of beauty and taste, as well as the philosophy of art (its own area of philosophy that comes out of aesthetics). It examines aesthetic values, often expressed th ...
, location, or character. Symbols and other bonus features of the game are typically aligned with the theme. Some themes are licensed from popular
media franchise
A media franchise, also known as a multimedia franchise, is a collection of related media in which several derivative works have been produced from an original creative work of fiction, such as a film, a work of literature, a television program or ...
s, including films, television series (including
game show
A game show is a genre of broadcast viewing entertainment (radio, television, internet, stage or other) where contestants compete for a reward. These programs can either be participatory or Let's Play, demonstrative and are typically directed b ...
s such as ''
Wheel of Fortune The Wheel of Fortune or ''Rota Fortunae'' has been a concept and metaphor since ancient times referring to the capricious nature of Fate. Wheel of Fortune may also refer to:
Arts, entertainment, and media Art
* ''The Wheel of Fortune'' (Burne-Jo ...
''), entertainers, and musicians.
Multi-line slot machines have become more popular since the 1990s. These machines have more than one payline, meaning that visible symbols that are not aligned on the main horizontal may be considered as winning combinations. Traditional three-reel slot machines commonly have one, three, or five paylines while video slot machines may have 9, 15, 25, or as many as 1024 different paylines. Most accept variable numbers of credits to play, with 1 to 15 credits per line being typical. The higher the amount bet, the higher the payout will be if the player wins.
One of the main differences between video slot machines and reel machines is in the way payouts are calculated. With reel machines, the only way to win the maximum jackpot is to play the maximum number of coins (usually three, sometimes four or even five coins per spin). With video machines, the fixed payout values are multiplied by the number of coins per line that is being bet. In other words: on a reel machine, the odds are more favorable if the gambler plays with the maximum number of coins available. However, depending on the structure of the game and its bonus features, some video slots may still include features that improve chances at payouts by making increased wagers.
"Multi-way" games eschew fixed paylines in favor of allowing symbols to pay anywhere, as long as there is at least one in at least three consecutive reels from left to right. Multi-way games may be configured to allow players to bet by-reel: for example, on a game with a 3x5 pattern (often referred to as a 243-way game), playing one reel allows all three symbols in the first reel to potentially pay, but only the center row pays on the remaining reels (often designated by darkening the unused portions of the reels). Other multi-way games use a 4x5 or 5x5 pattern, where there are up to five symbols in each reel, allowing for up to 1,024 and 3,125 ways to win respectively. The Australian manufacturer
Aristocrat Leisure
Aristocrat Leisure Limited is an Australian gambling machine manufacturer, which has its administrative and research headquarters in the Sydney suburb of North Ryde. It has marketing and development offices in South Africa, Russia, and the Uni ...
brands games featuring this system as "Reel Power", "Xtra Reel Power" and "Super Reel Power" respectively. A variation involves patterns where symbols pay adjacent to one another. Most of these games have a hexagonal reel formation, and much like multi-way games, any patterns not played are darkened out of use.
Denominations can range from 1 cent ("penny slots") all the way up to $100.00 or more per credit. The latter are typically known as "high limit" machines, and machines configured to allow for such wagers are often located in dedicated areas (which may have a separate team of attendants to cater to the needs of those who play there). The machine automatically calculates the number of credits the player receives in exchange for the cash inserted. Newer machines often allow players to choose from a selection of denominations on a
splash screen
A splash screen is a graphical control element consisting of a window containing an image, a logo, and the current version of the software. A splash screen can appear while a game or program is launching. A splash page is an introduction page on a ...
or menu.
Terminology
A bonus is a special feature of the particular game theme, which is activated when certain symbols appear in a winning combination. Bonuses and the number of bonus features vary depending upon the game. Some bonus rounds are a special session of free spins (the number of which is often based on the winning combination that triggers the bonus), often with a different or modified set of winning combinations as the main game and/or other multipliers or increased frequencies of symbols, or a "hold and re-spin" mechanic in which specific symbols (usually marked with values of credits or other prizes) are collected and locked in place over a finite number of spins. In other bonus rounds, the player is presented with several items on a screen from which to choose. As the player chooses items, a number of credits is revealed and awarded. Some bonuses use a mechanical device, such as a spinning wheel, that works in conjunction with the bonus to display the amount won.
A candle is a light on top of the slot machine. It flashes to alert the operator that change is needed, hand pay is requested or a potential problem with the machine. It can be lit by the player by pressing the "service" or "help" button.
Carousel refers to a grouping of slot machines, usually in a circle or oval formation.
A coin hopper is a container where the coins that are immediately available for payouts are held. The hopper is a mechanical device that rotates coins into the coin tray when a player collects credits/coins (by pressing a "Cash Out" button). When a certain preset coin capacity is reached, a coin diverter automatically redirects, or "drops", excess coins into a "drop bucket" or "drop box". (Unused coin hoppers can still be found even on games that exclusively employ Ticket-In, Ticket-Out technology, as a vestige.)
The credit meter is a display of the amount of money or number of credits on the machine. On mechanical slot machines, this is usually a
seven-segment display
A seven-segment display is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays.
Seven-segment displays are widely used in digital clocks, electronic meters, basic ...
, but video slot machines typically use stylized text that suits the game's theme and user interface.
The drop bucket or drop box is a container located in a slot machine's base where excess coins are diverted from the hopper. Typically, a drop bucket is used for low-denomination slot machines and a drop box is used for high-denomination slot machines. A drop box contains a hinged lid with one or more locks whereas a drop bucket does not contain a lid. The contents of drop buckets and drop boxes are collected and
counted by the casino on a scheduled basis.
EGM is short for "Electronic Gaming Machine".
Free spins are a common form of bonus, where a series of spins are automatically played at no charge at the player's current wager. Free spins are usually triggered via a scatter of at least three designated symbols (with the number of spins dependent on the number of symbols that land). Some games allow the free spins bonus to "retrigger", which adds additional spins on top of those already awarded. There is no theoretical limit to the number of free spins obtainable. Some games may have other features that can also trigger over the course of free spins.
A
hand pay
A hand pay (or handpay) is a condition where a slot machine cannot pay the patron in the typical manner, requiring the casino staff (such as the floor attendant or cashier) to pay the customer out manually (i.e., by hand).
In casinos which use c ...
refers to a payout made by an attendant or at an exchange point ("cage"), rather than by the slot machine itself. A hand pay occurs when the amount of the payout exceeds the maximum amount that was preset by the slot machine's operator. Usually, the maximum amount is set at the level where the operator must begin to deduct taxes. A hand pay could also be necessary as a result of a short pay.
Hopper fill slip is a document used to record the replenishment of the coin in the coin hopper after it becomes depleted as a result of making payouts to players. The slip indicates the amount of coin placed into the hoppers, as well as the signatures of the employees involved in the transaction, the slot machine number and the location and the date.
MEAL book (''M''achine ''e''ntry ''a''uthorization ''l''og) is a log of the employee's entries into the machine.
Low-level or slant-top slot machines include a stool so the player may sit down. Stand-up or upright slot machines are played while standing.
Optimal play is a payback percentage based on a gambler using the optimal strategy in a skill-based slot machine game.
Payline is a line that crosses through one symbol on each reel, along which a winning combination is evaluated. Classic spinning reel machines usually have up to nine paylines, while video slot machines may have as many as one hundred. Paylines could be of various shapes (horizontal, vertical, oblique, triangular, zigzag, etc.)
Persistent state refers to passive features on some slot machines, some of which able to trigger bonus payouts or other special features if certain conditions are met over time by players on that machine.
Roll-up is the process of dramatizing a win by playing sounds while the meters count up to the amount that has been won.
Short pay refers to a partial payout made by a slot machine, which is less than the amount due to the player. This occurs if the coin hopper has been depleted as a result of making earlier payouts to players. The remaining amount due to the player is either paid as a hand pay or an attendant will come and refill the machine.
A scatter is a pay combination based on occurrences of a designated symbol landing anywhere on the reels, rather than falling in sequence on the same payline. A scatter pay usually requires a minimum of three symbols to land, and the machine may offer increased prizes or jackpots depending on the number that land. Scatters are frequently used to trigger bonus games, such as free spins (with the number of spins multiplying based on the number of scatter symbols that land). The scatter symbol usually cannot be matched using wilds, and some games may require the scatter symbols to appear on consecutive reels in order to pay. On some multiway games, scatter symbols still pay in unused areas.
Taste is a reference to the small amount often paid out to keep a player seated and continuously betting. Only rarely will machines fail to pay even the minimum out over the course of several pulls.
Tilt is a term derived from electromechanical slot machines' "
tilt switches", which would make or break a circuit when they were tilted or otherwise tampered with that triggered an alarm. While modern machines no longer have tilt switches, any kind of technical fault (door switch in the wrong state, reel motor failure, out of paper, etc.) is still called a "tilt".
A theoretical hold worksheet is a document provided by the manufacturer for every slot machine that indicates the theoretical percentage the machine should hold based on the amount paid in. The worksheet also indicates the reel strip settings, number of coins that may be played, the payout schedule, the number of reels and other information descriptive of the particular type of slot machine.
Volatility or variance refers to the measure of risk associated with playing a slot machine. A low-volatility slot machine has regular but smaller wins, while a high-variance slot machine has fewer but bigger wins.
Weight count is an American term referring to the total value of coins or tokens removed from a slot machine's drop bucket or drop box for counting by the casino's
hard count Hard count is one process for counting coins in a casino or bank. The hard count rooms are usually among the most secure places due to the large amounts of cash that can be on hand at any one time.
Typically, coins are not counted on a piece basis. ...
team through the use of a weigh scale.
Wild symbols substitute for most other symbols in the game (similarly to a
joker card), usually excluding scatter and jackpot symbols (or offering a lower prize on non-natural combinations that include wilds). How jokers behave are dependent on the specific game and whether the player is in a bonus or free games mode. Sometimes wild symbols may only appear on certain reels, or have a chance to "stack" across the entire reel.
Pay table
Each machine has a table that lists the number of credits the player will receive if the symbols listed on the pay table line up on the pay line of the machine. Some symbols are wild and can represent many, or all, of the other symbols to complete a winning line. Especially on older machines, the pay table is listed on the face of the machine, usually above and below the area containing the wheels. On video slot machines, they are usually contained within a help menu, along with information on other features.
Technology
Reels
Historically, all slot machines used revolving mechanical reels to display and determine results. Although the original slot machine used five reels, simpler, and therefore more reliable, three reel machines quickly became the standard.
A problem with three reel machines is that the number of combinations is only
cubic – the original slot machine with three physical reels and 10 symbols on each reel had only 10
3 = 1,000 possible combinations. This limited the manufacturer's ability to offer large jackpots since even the rarest event had a likelihood of 0.1%. The maximum theoretical payout, assuming 100% return to player would be 1000 times the bet, but that would leave no room for other pays, making the machine very high risk, and also quite boring.
Although the number of symbols eventually increased to about 22, allowing 10,648 combinations, this still limited jackpot sizes as well as the number of possible outcomes.
In the 1980s, however, slot machine manufacturers incorporated electronics into their products and programmed them to weight particular symbols. Thus the odds of losing symbols appearing on the payline became disproportionate to their actual frequency on the physical reel. A symbol would only appear once on the reel displayed to the player, but could, in fact, occupy several stops on the multiple reel.
In 1984, Inge Telnaes received a patent for a device titled, "Electronic Gaming Device Utilizing a Random Number Generator for Selecting the Reel Stop Positions" (US Patent 4448419), which states: "It is important to make a machine that is perceived to present greater chances of payoff than it actually has within the legal limitations that games of chance must operate." The patent was later bought by
International Game Technology
International Game Technology PLC (IGT), formerly Gtech S.p.A. and Lottomatica S.p.A., is a multinational gambling company that produces slot machines and other gambling technology. The company is headquartered in London, with major offices in ...
and has since expired.
A virtual reel that has 256 virtual stops per reel would allow up to 256
3 = 16,777,216 final positions. The manufacturer could choose to offer a $1 million jackpot on a $1 bet, confident that it will only happen, over the long term, once every 16.8 million plays.
Computerization
With
microprocessor
A microprocessor is a computer processor where the data processing logic and control is included on a single integrated circuit, or a small number of integrated circuits. The microprocessor contains the arithmetic, logic, and control circu ...
s now ubiquitous, the computers inside modern slot machines allow manufacturers to assign a different probability to every symbol on every reel. To the player, it might appear that a winning symbol was "so close", whereas in fact the probability is much lower.
In the 1980s in the U.K., machines embodying microprocessors became common. These used a number of features to ensure the payout was controlled within the limits of the gambling legislation. As a coin was inserted into the machine, it could go either directly into the cashbox for the benefit of the owner or into a channel that formed the payout reservoir, with the microprocessor monitoring the number of coins in this channel. The drums themselves were driven by stepper motors, controlled by the processor and with proximity sensors monitoring the position of the drums. A "look-up table" within the software allows the processor to know what symbols were being displayed on the drums to the gambler. This allowed the system to control the level of payout by stopping the drums at positions it had determined. If the payout channel had filled up, the payout became more generous; if nearly empty, the payout became less so (thus giving good control of the odds).
Video slot machines
Video slot machines do not use mechanical reels, but use graphical reels on a computerized
display
Display may refer to:
Technology
* Display device, output device for presenting information, including:
** Cathode ray tube, video display that provides a quality picture, but can be very heavy and deep
** Electronic visual display, output devi ...
. As there are no mechanical constraints on the design of video slot machines, games often use at least five reels, and may also use non-standard layouts. This greatly expands the number of possibilities: a machine can have 50 or more symbols on a reel, giving
odds
Odds provide a measure of the likelihood of a particular outcome. They are calculated as the ratio of the number of events that produce that outcome to the number that do not. Odds are commonly used in gambling and statistics.
Odds also have ...
as high as 300 million to 1 against – enough for even the largest jackpot. As there are so many combinations possible with five reels, manufacturers do not need to weight the payout symbols (although some may still do so). Instead, higher paying symbols will typically appear only once or twice on each reel, while more common symbols earning a more frequent payout will appear many times. Video slot machines usually make more extensive use of
multimedia
Multimedia is a form of communication that uses a combination of different content forms such as text, audio, images, animations, or video into a single interactive presentation, in contrast to tradition ...
, and can feature more elaborate
minigame
A minigame (also spelled mini game and mini-game, sometimes called a subgame or microgame) is a short game often contained within another video game. A minigame contains different gameplay elements, and is often smaller or more simplistic, than th ...
s as bonuses. Modern cabinets typically use
flat-panel display
A flat-panel display (FPD) is an electronic display used to display visual content such as text or images. It is present in consumer, medical, transportation, and industrial equipment.
Flat-panel displays are thin, lightweight, provide better li ...
s, but cabinets using larger
curved screen
A curved screen is an electronic display device that, contrasting with the flat-panel display, features a concave viewing surface. Curved screen TVs were introduced to the consumer market in 2013, primarily due to the efforts of Korean companies S ...
s (which can provide a more immersive experience for the player) are not uncommon.
Video slot machines typically encourage the player to play multiple "lines": rather than simply taking the middle of the three symbols displayed on each reel, a line could go from top left to the bottom right or any other pattern specified by the manufacturer. As each symbol is equally likely, there is no difficulty for the manufacturer in allowing the player to take as many of the possible lines on offer as desire – the long-term return to the player will be the same. The difference for the player is that the more lines they play, the more likely they are to get paid on a given spin (because they are betting more).
To avoid seeming as if the player's money is simply ebbing away (whereas a payout of 100 credits on a single-line machine would be 100 bets and the player would feel they had made a substantial win, on a 20-line machine, it would only be five bets and not seem as significant), manufacturers commonly offer bonus games, which can return many times their bet. The player is encouraged to keep playing to reach the bonus: even if they are losing, the bonus game could allow them to win back their losses.
Random number generators
All modern machines are designed using
pseudorandom number generator
A pseudorandom number generator (PRNG), also known as a deterministic random bit generator (DRBG), is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers. The PRNG-generate ...
s ("PRNGs"), which are constantly generating a sequence of simulated random numbers, at a rate of hundreds or perhaps thousands per second. As soon as the "Play" button is pressed, the most recent random number is used to determine the result. This means that the result varies depending on exactly when the game is played. A fraction of a second earlier or later and the result would be different.
It is important that the machine contains a high-quality RNG implementation. Because all PRNGs must eventually repeat their number sequence and, if the period is short or the PRNG is otherwise flawed, an advanced player may be able to "predict" the next result. Having access to the PRNG code and seed values,
Ronald Dale Harris
Ronald Dale Harris is a computer programmer who worked for the Nevada Gaming Control Board in the early 1990s and was responsible for finding flaws and gaffes in software that runs computerized casino games. Harris took advantage of his expertis ...
, a former slot machine programmer, discovered equations for specific gambling games like
Keno
Keno is a lottery-like gambling game often played at modern casinos, and also offered as a game in some lotteries.
Players wager by choosing numbers ranging from 1 through (usually) 80. After all players make their wagers, 20 numbers (some va ...
that allowed him to predict what the next set of selected numbers would be based on the previous games played.
Most machines are designed to defeat this by generating numbers even when the machine is not being played so the player cannot tell where in the sequence they are, even if they know how the machine was programmed.
Payout percentage
Slot machines are typically programmed to pay out as winnings 0% to 99% of the money that is wagered by players. This is known as the "theoretical payout percentage" or RTP, "return to player". The minimum theoretical payout percentage varies among jurisdictions and is typically established by law or regulation. For example, the minimum payout in
Nevada
Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
is 75%, in
New Jersey
New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...
83%, and in Mississippi 80%. The winning patterns on slot machines – the amounts they pay and the frequencies of those payouts – are carefully selected to yield a certain fraction of the money paid to the "house" (the operator of the slot machine) while returning the rest to the players during play. Suppose that a certain slot machine costs $1 per spin and has a return to player (RTP) of 95%. It can be calculated that, over a sufficiently long period such as 1,000,000 spins, the machine will return an average of $950,000 to its players, who have inserted $1,000,000 during that time. In this (simplified) example, the slot machine is said to pay out 95%. The operator keeps the remaining $50,000. Within some EGM development organizations this concept is referred to simply as "par". "Par" also manifests itself to gamblers as promotional techniques: "Our 'Loose Slots' have a 93% payback! Play now!"
A slot machine's theoretical payout percentage is set at the factory when the
software
Software is a set of computer programs and associated documentation and data. This is in contrast to hardware, from which the system is built and which actually performs the work.
At the lowest programming level, executable code consists ...
is written. Changing the payout percentage after a slot machine has been placed on the gaming floor requires a physical swap of the software or ''
firmware
In computing, firmware is a specific class of computer software that provides the low-level control for a device's specific hardware. Firmware, such as the BIOS of a personal computer, may contain basic functions of a device, and may provide h ...
'', which is usually stored on an
EPROM
An EPROM (rarely EROM), or erasable programmable read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off. Computer memory that can retrieve stored data after a power s ...
but may be loaded onto non-volatile random access memory (
NVRAM
Non-volatile random-access memory (NVRAM) is random-access memory that retains data without applied power. This is in contrast to dynamic random-access memory (DRAM) and static random-access memory (SRAM), which both maintain data only for as lon ...
) or even stored on
CD-ROM
A CD-ROM (, compact disc read-only memory) is a type of read-only memory consisting of a pre-pressed optical compact disc that contains data. Computers can read—but not write or erase—CD-ROMs. Some CDs, called enhanced CDs, hold both comput ...
or
DVD
The DVD (common abbreviation for Digital Video Disc or Digital Versatile Disc) is a digital optical disc data storage format. It was invented and developed in 1995 and first released on November 1, 1996, in Japan. The medium can store any kind ...
, depending on the capabilities of the machine and the applicable regulations. In certain jurisdictions, such as New Jersey, the EPROM has a
tamper-evident
Tamper-evident describes a device or process that makes unauthorized access to the protected object easily detected. Seals, markings, or other techniques may be tamper indicating.
Tampering
Tampering involves the deliberate altering or adultera ...
seal
Seal may refer to any of the following:
Common uses
* Pinniped, a diverse group of semi-aquatic marine mammals, many of which are commonly called seals, particularly:
** Earless seal, or "true seal"
** Fur seal
* Seal (emblem), a device to impr ...
and can only be changed in the presence of
Gaming Control Board
A gaming control board (GCB), also called by various names including gambling control board, casino control board, gambling board, and gaming commission, is a government agency charged with regulating casino and other types of gaming in a defined ...
officials. Other jurisdictions, including Nevada, randomly
audit
An audit is an "independent examination of financial information of any entity, whether profit oriented or not, irrespective of its size or legal form when such an examination is conducted with a view to express an opinion thereon.” Auditing ...
slot machines to ensure that they contain only approved software.
Historically, many casinos, both online and offline, have been unwilling to publish individual game RTP figures, making it impossible for the player to know whether they are playing a "loose" or a "tight" game. Since the turn of the century, some information regarding these figures has started to come into the public domain either through various casinos releasing them—primarily this applies to online casinos—or through studies by independent gambling authorities.
The ''return to player'' is not the only statistic that is of interest. The probabilities of every payout on the pay table is also critical. For example, consider a hypothetical slot machine with a dozen different values on the pay table. However, the probabilities of getting all the payouts are zero except the largest one. If the payout is 4,000 times the input amount, and it happens every 4,000 times on average, the ''return to player'' is exactly 100%, but the game would be dull to play. Also, most people would not win anything, and having entries on the paytable that have a return of zero would be deceptive. As these individual probabilities are closely guarded secrets, it is possible that the advertised machines with high return to player simply increase the probabilities of these jackpots. The casino could legally place machines of a similar style payout and advertise that some machines have 100% return to player. The added advantage is that these large jackpots increase the excitement of the other players.
The table of probabilities for a specific machine is called the Probability and Accounting Report or PAR sheet, also PARS commonly understood as Paytable and Reel Strips. Mathematician
Michael Shackleford
Michael Shackleford, (May 23, 1965 in Pasadena, California, United States), also known as "The Wizard of Odds" (a title taken from Donald Angelini), is an American mathematician and an actuary. He is best known for his professional analysis o ...
revealed the PARS for one commercial slot machine, an original
International Gaming Technology
International is an adjective (also used as a noun) meaning "between nations".
International may also refer to:
Music Albums
* ''International'' (Kevin Michael album), 2011
* ''International'' (New Order album), 2002
* ''International'' (The T ...
''Red White and Blue'' machine. This game, in its original form, is obsolete, so these specific probabilities do not apply. He only published the odds after a fan of his sent him some information provided on a slot machine that was posted on a machine in the Netherlands. The psychology of the machine design is quickly revealed. There are 13 possible payouts ranging from 1:1 to 2,400:1. The 1:1 payout comes every 8 plays. The 5:1 payout comes every 33 plays, whereas the 2:1 payout comes every 600 plays. Most players assume the likelihood increases proportionate to the payout. The one mid-size payout that is designed to give the player a thrill is the 80:1 payout. It is programmed to occur an average of once every 219 plays. The 80:1 payout is high enough to create excitement, but not high enough that it makes it likely that the player will take their winnings and abandon the game. More than likely the player began the game with at least 80 times his bet (for instance there are 80 quarters in $20). In contrast the 150:1 payout occurs only on average of once every 6,241 plays. The highest payout of 2,400:1 occurs only on average of once every 64
3 = 262,144 plays since the machine has 64 virtual stops. The player who continues to feed the machine is likely to have several mid-size payouts, but unlikely to have a large payout. He quits after he is bored or has exhausted his bankroll.
Despite their confidentiality, occasionally a PAR sheet is posted on a website. They have limited value to the player, because usually a machine will have 8 to 12 different possible programs with varying payouts. In addition, slight variations of each machine (e.g., with ''double jackpots'' or ''five times play'') are always being developed. The casino operator can choose which EPROM chip to install in any particular machine to select the payout desired. The result is that there is not really such a thing as a high payback type of machine, since every machine potentially has multiple settings. From October 2001 to February 2002, columnist Michael Shackleford obtained PAR sheets for five different nickel machines; four IGT games ''
Austin Powers
''Austin Powers'' is a series of American spy action comedy films: '' Austin Powers: International Man of Mystery'' (1997), '' Austin Powers: The Spy Who Shagged Me'' (1999) and '' Austin Powers in Goldmember'' (2002). The films were produced ...
'', ''Fortune Cookie'', ''Leopard Spots'' and ''
Wheel of Fortune The Wheel of Fortune or ''Rota Fortunae'' has been a concept and metaphor since ancient times referring to the capricious nature of Fate. Wheel of Fortune may also refer to:
Arts, entertainment, and media Art
* ''The Wheel of Fortune'' (Burne-Jo ...
'' and one game manufactured by WMS; ''Reel 'em In''. Without revealing the proprietary information, he developed a program that would allow him to determine with usually less than a dozen plays on each machine which EPROM chip was installed. Then he did a survey of over 400 machines in 70 different casinos in Las Vegas. He averaged the data, and assigned an average payback percentage to the machines in each casino. The resultant list was widely publicized for marketing purposes (especially by the Palms casino which had the top ranking).
One reason that the slot machine is so profitable to a casino is that the player must play the ''high house edge and high payout'' wagers along with the ''low house edge and low payout'' wagers. In a more traditional wagering game like craps, the player knows that certain wagers have almost a 50/50 chance of winning or losing, but they only pay a limited multiple of the original bet (usually no higher than three times). Other bets have a higher house edge, but the player is rewarded with a bigger win (up to thirty times in craps). The player can choose what kind of wager he wants to make. A slot machine does not afford such an opportunity. Theoretically, the operator could make these probabilities available, or allow the player to choose which one so that the player is free to make a choice. However, no operator has ever enacted this strategy. Different machines have different maximum payouts, but without knowing the odds of getting the jackpot, there is no rational way to differentiate.
In many markets where central monitoring and control systems are used to link machines for auditing and security purposes, usually in
wide area network
A wide area network (WAN) is a telecommunications network that extends over a large geographic area. Wide area networks are often established with leased telecommunication circuits.
Businesses, as well as schools and government entities, us ...
s of multiple venues and thousands of machines, player return must usually be changed from a central computer rather than at each machine. A range of percentages is set in the game software and selected remotely.
In 2006, the Nevada Gaming Commission began working with Las Vegas casinos on technology that would allow the casino's management to change the game, the odds, and the payouts remotely. The change cannot be done instantaneously, but only after the selected machine has been idle for at least four minutes. After the change is made, the machine must be locked to new players for four minutes and display an on-screen message informing potential players that a change is being made.
Linked machines
Some varieties of slot machines can be linked together in a setup sometimes known as a "community" game. The most basic form of this setup involves
progressive jackpot
A progressive jackpot is a jackpot (a gambling grand prize or payout) which increases each time the game is played but the jackpot is ''not'' won. When the progressive jackpot is won, the jackpot for the next play is reset to a predetermined value ...
s that are shared between the bank of machines, but may include multiplayer bonuses and other features.
In some cases multiple machines are linked across multiple casinos. In these cases, the machines may be owned by the manufacturer, who is responsible for paying the jackpot. The casinos
lease
A lease is a contractual arrangement calling for the user (referred to as the ''lessee'') to pay the owner (referred to as the ''lessor'') for the use of an asset. Property, buildings and vehicles are common assets that are leased. Industrial ...
the machines rather than owning them outright. Casinos in New Jersey, Nevada, Louisiana, Arkansas, and
South Dakota
South Dakota (; Sioux language, Sioux: , ) is a U.S. state in the West North Central states, North Central region of the United States. It is also part of the Great Plains. South Dakota is named after the Lakota people, Lakota and Dakota peo ...
now offer multi-state progressive jackpots, which now offer bigger jackpot pools.
Fraud
Mechanical slot machines and their coin acceptors were sometimes susceptible to cheating devices and other scams. One historical example involved spinning a coin with a short length of plastic wire. The weight and size of the coin would be accepted by the machine and credits would be granted. However, the spin created by the plastic wire would cause the coin to exit through the reject chute into the payout tray. This particular scam has become obsolete due to improvements in newer slot machines. Another obsolete method of defeating slot machines was to use a light source to confuse the optical sensor used to count coins during payout.
Modern slot machines are controlled by EPROM computer chips and, in large casinos, coin acceptors have become obsolete in favor of bill acceptors. These machines and their bill acceptors are designed with advanced anti-cheating and anti-counterfeiting measures and are difficult to defraud. Early computerized slot machines were sometimes defrauded through the use of cheating devices, such as the "slider", "monkey paw", "lightwand" and "the tongue". Many of these old cheating devices were made by the late Tommy Glenn Carmichael, a slot machine fraudster who reportedly stole over $5 million. In the modern day, computerized slot machines are fully deterministic and thus outcomes can be sometimes successfully predicted.
Skill stops
Skill stop buttons predated the Bally electromechanical slot machines of the 1960s and 1970s. They appeared on mechanical slot machines manufactured by Mills Novelty Co. as early as the mid 1920s. These machines had modified reel-stop arms, which allowed them to be released from the timing bar, earlier than in a normal play, simply by pressing the buttons on the front of the machine, located between each reel.
"Skill stop" buttons were added to some slot machines by Zacharias Anthony in the early 1970s. These enabled the player to stop each reel, allowing a degree of "skill" so as to satisfy the
New Jersey
New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...
gaming laws of the day which required that players were able to control the game in some way. The original conversion was applied to approximately 50 late-model Bally slot machines. Because the typical machine stopped the reels automatically in less than 10 seconds, weights were added to the mechanical timers to prolong the automatic stopping of the reels. By the time the New Jersey Alcoholic Beverages Commission (ABC) had approved the conversion for use in New Jersey arcades, the word was out and every other distributor began adding skill stops. The machines were a huge hit on the
Jersey Shore
The Jersey Shore (known by locals simply as the Shore) is the coastal region of the U.S. state of New Jersey. Geographically, the term encompasses about of oceanfront bordering the Atlantic Ocean, from Perth Amboy in the north to Cape May Po ...
and the remaining unconverted Bally machines were destroyed as they had become instantly obsolete.
Legislation
United States
In the United States, the public and private availability of slot machines is
highly regulated by state governments. Many states have established
gaming control board
A gaming control board (GCB), also called by various names including gambling control board, casino control board, gambling board, and gaming commission, is a government agency charged with regulating casino and other types of gaming in a defined ...
s to regulate the possession and use of slot machines and other form of gaming.
Nevada
Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
is the only state that has no significant restrictions against slot machines both for public and private use. In
New Jersey
New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...
, slot machines are only allowed in hotel casinos operated in
Atlantic City
Atlantic City, often known by its initials A.C., is a coastal resort city in Atlantic County, New Jersey, United States. The city is known for its casinos, Boardwalk (entertainment district), boardwalk, and beaches. In 2020 United States censu ...
. Several states (
Indiana
Indiana () is a U.S. state in the Midwestern United States. It is the 38th-largest by area and the 17th-most populous of the 50 States. Its capital and largest city is Indianapolis. Indiana was admitted to the United States as the 19th s ...
,
Louisiana
Louisiana , group=pronunciation (French: ''La Louisiane'') is a state in the Deep South and South Central regions of the United States. It is the 20th-smallest by area and the 25th most populous of the 50 U.S. states. Louisiana is borde ...
and
Missouri
Missouri is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. Ranking List of U.S. states and territories by area, 21st in land area, it is bordered by eight states (tied for the most with Tennessee ...
) allow slot machines (as well as any casino-style gambling) only on licensed
riverboat
A riverboat is a watercraft designed for inland navigation on lakes, rivers, and artificial waterways. They are generally equipped and outfitted as work boats in one of the carrying trades, for freight or people transport, including luxury un ...
s or permanently anchored
barge
Barge nowadays generally refers to a flat-bottomed inland waterway vessel which does not have its own means of mechanical propulsion. The first modern barges were pulled by tugs, but nowadays most are pushed by pusher boats, or other vessels ...
s. Since
Hurricane Katrina
Hurricane Katrina was a destructive Category 5 Atlantic hurricane that caused over 1,800 fatalities and $125 billion in damage in late August 2005, especially in the city of New Orleans and the surrounding areas. It was at the time the cost ...
,
Mississippi
Mississippi () is a state in the Southeastern region of the United States, bordered to the north by Tennessee; to the east by Alabama; to the south by the Gulf of Mexico; to the southwest by Louisiana; and to the northwest by Arkansas. Miss ...
has removed the requirement that casinos on the Gulf Coast operate on barges and now allows them on land along the shoreline.
Delaware
Delaware ( ) is a state in the Mid-Atlantic region of the United States, bordering Maryland to its south and west; Pennsylvania to its north; and New Jersey and the Atlantic Ocean to its east. The state takes its name from the adjacent Del ...
allows slot machines at three horse tracks; they are regulated by the
state lottery
In the United States, lotteries are run by 48 jurisdictions: 45 states plus the District of Columbia, Puerto Rico, and the U.S. Virgin Islands.
Lotteries are subject to the laws of and operated independently by each jurisdiction, and there is no ...
commission. In Wisconsin, bars and taverns are allowed to have up to five machines. These machines usually allow a player to either take a payout, or gamble it on a double-or-nothing "side game".
The
territory
A territory is an area of land, sea, or space, particularly belonging or connected to a country, person, or animal.
In international politics, a territory is usually either the total area from which a state may extract power resources or a ...
of
Puerto Rico
Puerto Rico (; abbreviated PR; tnq, Boriken, ''Borinquen''), officially the Commonwealth of Puerto Rico ( es, link=yes, Estado Libre Asociado de Puerto Rico, lit=Free Associated State of Puerto Rico), is a Caribbean island and Unincorporated ...
places significant restrictions on slot machine ownership, but the law is widely flouted and slot machines are common in bars and coffeeshops.
In regards to
tribal casinos
Native American gaming comprises casinos, bingo halls, and other gambling operations on Indian reservations or other tribal lands in the United States. Because these areas have tribal sovereignty, states have limited ability to forbid gambling t ...
located on
Native American reservations
An Indian reservation is an area of land held and governed by a federally recognized Native American tribal nation whose government is accountable to the United States Bureau of Indian Affairs and not to the state government in which it ...
, slot machines played against the house and operating independently from a
centralized computer system are classified as "Class III" gaming by the
Indian Gaming Regulatory Act
The Indian Gaming Regulatory Act (, ''et seq.'') is a 1988 United States federal law that establishes the jurisdictional framework that governs Indian gaming. There was no federal gaming structure before this act. The stated purposes of the ac ...
(IGRA), and sometimes promoted as "Vegas-style" slot machines. In order to offer Class III gaming, tribes must enter into a
compact
Compact as used in politics may refer broadly to a pact or treaty; in more specific cases it may refer to:
* Interstate compact
* Blood compact, an ancient ritual of the Philippines
* Compact government, a type of colonial rule utilized in British ...
(agreement) with the state that is approved by the
Department of the Interior, which may contain restrictions on the types and quantity of such games. As a workaround, some casinos may operate slot machines as "Class II" games—a category that includes games where players play exclusively against at least one other opponent and not the house, such as
bingo
Bingo or B-I-N-G-O may refer to:
Arts and entertainment Gaming
* Bingo, a game using a printed card of numbers
** Bingo (British version), a game using a printed card of 15 numbers on three lines; most commonly played in the UK and Ireland
** Bi ...
or any related games (such as
pull-tab
A pull-tab is a gambling ticket for a pull-tab game. Other names for the game include Break-Opens, Nevada Tickets, Cherry Bells, Lucky 7s, Pickle Cards, Instant Bingo, Bowl Games, or Popp-Opens.
Physical pull-tab tickets are multi-layered pape ...
s). In these cases, the reels are an entertainment display with a pre-determined outcome based on a centralized game played against other players. Under the IGRA, Class II games are regulated by individual tribes and the
National Indian Gaming Commission
The National Indian Gaming Commission (NIGC; ) is a United States federal regulatory agency within the Department of the Interior. Congress established the agency pursuant to the Indian Gaming Regulatory Act in 1988.
The commission is the only ...
, and do not require any additional approval if the state already permits tribal gaming.
Some
historical race wagering terminals operate in a similar manner, with the machines using slots as an entertainment display for outcomes paid using the
parimutuel betting
Parimutuel betting or pool betting is a betting system in which all bets of a particular type are placed together in a pool; taxes and the "house-take" or "vigorish" are deducted, and payoff odds are calculated by sharing the pool among all winnin ...
system, based on results of randomly-selected, previously-held
horse races (with the player able to view selected details about the race and adjust their picks before playing the credit, or otherwise use an auto-bet system).
Private ownership
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S., ...
,
Arizona
Arizona ( ; nv, Hoozdo Hahoodzo ; ood, Alĭ ṣonak ) is a state in the Southwestern United States. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona is part of the Fou ...
,
Arkansas
Arkansas ( ) is a landlocked state in the South Central United States. It is bordered by Missouri to the north, Tennessee and Mississippi to the east, Louisiana to the south, and Texas and Oklahoma to the west. Its name is from the Osage ...
,
Kentucky
Kentucky ( , ), officially the Commonwealth of Kentucky, is a state in the Southeastern region of the United States and one of the states of the Upper South. It borders Illinois, Indiana, and Ohio to the north; West Virginia and Virginia to ...
,
Maine
Maine () is a state in the New England and Northeastern regions of the United States. It borders New Hampshire to the west, the Gulf of Maine to the southeast, and the Canadian provinces of New Brunswick and Quebec to the northeast and north ...
,
Minnesota
Minnesota () is a state in the upper midwestern region of the United States. It is the 12th largest U.S. state in area and the 22nd most populous, with over 5.75 million residents. Minnesota is home to western prairies, now given over to ...
,
Nevada
Nevada ( ; ) is a U.S. state, state in the Western United States, Western region of the United States. It is bordered by Oregon to the northwest, Idaho to the northeast, California to the west, Arizona to the southeast, and Utah to the east. N ...
,
Ohio
Ohio () is a state in the Midwestern region of the United States. Of the fifty U.S. states, it is the 34th-largest by area, and with a population of nearly 11.8 million, is the seventh-most populous and tenth-most densely populated. The sta ...
,
Rhode Island
Rhode Island (, like ''road'') is a U.S. state, state in the New England region of the Northeastern United States. It is the List of U.S. states by area, smallest U.S. state by area and the List of states and territories of the United States ...
,
Texas
Texas (, ; Spanish language, Spanish: ''Texas'', ''Tejas'') is a state in the South Central United States, South Central region of the United States. At 268,596 square miles (695,662 km2), and with more than 29.1 million residents in 2 ...
,
Utah
Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...
,
Virginia
Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth ar ...
, and
West Virginia
West Virginia is a state in the Appalachian, Mid-Atlantic and Southeastern regions of the United States.The Census Bureau and the Association of American Geographers classify West Virginia as part of the Southern United States while the Bur ...
place no restrictions on private ownership of slot machines. Conversely, in
Connecticut
Connecticut () is the southernmost state in the New England region of the Northeastern United States. It is bordered by Rhode Island to the east, Massachusetts to the north, New York to the west, and Long Island Sound to the south. Its cap ...
,
Hawaii
Hawaii ( ; haw, Hawaii or ) is a state in the Western United States, located in the Pacific Ocean about from the U.S. mainland. It is the only U.S. state outside North America, the only state that is an archipelago, and the only stat ...
,
Nebraska
Nebraska () is a state in the Midwestern region of the United States. It is bordered by South Dakota to the north; Iowa to the east and Missouri to the southeast, both across the Missouri River; Kansas to the south; Colorado to the southwe ...
,
South Carolina
)''Animis opibusque parati'' ( for, , Latin, Prepared in mind and resources, links=no)
, anthem = " Carolina";" South Carolina On My Mind"
, Former = Province of South Carolina
, seat = Columbia
, LargestCity = Charleston
, LargestMetro = ...
, and
Tennessee
Tennessee ( , ), officially the State of Tennessee, is a landlocked state in the Southeastern region of the United States. Tennessee is the 36th-largest by area and the 15th-most populous of the 50 states. It is bordered by Kentucky to th ...
, private ownership of any slot machine is completely prohibited. The remaining states allow slot machines of a certain age (typically 25–30 years) or slot machines manufactured before a specific date.
Canada
The Government of Canada has minimal involvement in gambling beyond the Canadian
Criminal Code
A criminal code (or penal code) is a document that compiles all, or a significant amount of a particular jurisdiction's criminal law. Typically a criminal code will contain offences that are recognised in the jurisdiction, penalties that migh ...
. In essence, the term "lottery scheme" used in the code means slot machines, bingo and table games normally associated with a casino. These fall under the jurisdiction of the province or territory without reference to the federal government; in practice, all Canadian provinces operate gaming boards that oversee lotteries, casinos and
video lottery terminal
A video lottery terminal (VLT), also sometimes known as a video gaming terminal (VGT), video slots, or the video lottery, is a type of electronic gambling machine. They are typically operated by a region's lottery, and situated at licensed establis ...
s under their jurisdiction.
OLG piloted a classification system for slot machines at the
Grand River Raceway developed by University of Waterloo professor Kevin Harrigan, as part of its PlaySmart initiative for responsible gambling. Inspired by
nutrition labels on foods, they displayed metrics such as volatility and frequency of payouts. OLG has also deployed electronic gaming machines with pre-determined outcomes based on a bingo or pull-tab game, initially branded as "TapTix", which visually resemble slot machines.
In Ontario, 4 April 2022 saw the re-introduction of the online gambling market. This became possible when the Canadian Criminal Code was amended to allow single-event wagering August 2021. The province is expected to generate about $800 million in gross revenue per year.
Australia
In Australia "Poker Machines" or "pokies" are officially termed "gaming machines". In Australia, gaming machines are a matter for state governments, so laws vary between states. Gaming machines are found in casinos (approximately one in each major city),
pub
A pub (short for public house) is a kind of drinking establishment which is licensed to serve alcoholic drinks for consumption on the premises. The term ''public house'' first appeared in the United Kingdom in late 17th century, and was ...
s and clubs in some states (usually sports, social, or
RSL clubs). The first Australian state to legalize this style of gambling was
New South Wales
)
, nickname =
, image_map = New South Wales in Australia.svg
, map_caption = Location of New South Wales in AustraliaCoordinates:
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, es ...
, when in 1956 they were made legal in all registered clubs in the state. There are suggestions that the proliferation of poker machines has led to increased levels of
problem gambling
Problem gambling or ludomania is repetitive gambling behavior despite harm and negative consequences. Problem gambling may be diagnosed as a mental disorder according to ''DSM-5'' if certain diagnostic criteria are met. Pathological gambling is ...
; however, the precise nature of this link is still open to research.
In 1999 the Australian Productivity Commission reported that nearly half Australia's gaming machines were in New South Wales. At the time, 21% of all the gambling machines in the world were operating in Australia and, on a per capita basis, Australia had roughly five times as many gaming machines as the United States. Australia ranks 8th in total number of gaming machines after Japan, U.S.A., Italy, U.K., Spain and Germany. This primarily is because gaming machines have been legal in the state of New South Wales since 1956; over time, the number of machines has grown to 97,103 (at December 2010, including the Australian Capital Territory). By way of comparison, the U.S. State of Nevada, which legalised gaming including slots several decades before N.S.W., had 190,135 slots operating.
Revenue from gaming machines in pubs and clubs accounts for more than half of the $4 billion in gambling revenue collected by state governments in fiscal year 2002–03.
In
Queensland
)
, nickname = Sunshine State
, image_map = Queensland in Australia.svg
, map_caption = Location of Queensland in Australia
, subdivision_type = Country
, subdivision_name = Australia
, established_title = Before federation
, established_ ...
, gaming machines in pubs and clubs must provide a return rate of 85%, while machines located in casinos must provide a return rate of 90%. Most other states have similar provisions. In
Victoria
Victoria most commonly refers to:
* Victoria (Australia), a state of the Commonwealth of Australia
* Victoria, British Columbia, provincial capital of British Columbia, Canada
* Victoria (mythology), Roman goddess of Victory
* Victoria, Seychelle ...
, gaming machines must provide a minimum return rate of 87% (including jackpot contribution), including machines in
Crown Casino. As of December 1, 2007, Victoria banned gaming machines that accepted $100 notes; all gaming machines made since 2003 comply with this rule. This new law also banned machines with an automatic play option. One exception exists in Crown Casino for any player with a VIP loyalty card: they can still insert $100 notes and use an autoplay feature (whereby the machine will automatically play until credit is exhausted or the player intervenes). All gaming machines in Victoria have an information screen accessible to the user by pressing the "i key" button, showing the game rules, paytable, return to player percentage, and the top and bottom five combinations with their odds. These combinations are stated to be played on a minimum bet (usually 1 credit per line, with 1 line or reel played, although some newer machines do not have an option to play 1 line; some machines may only allow maximum lines to be played), excluding feature wins.
Western Australia
Western Australia (commonly abbreviated as WA) is a state of Australia occupying the western percent of the land area of Australia excluding external territories. It is bounded by the Indian Ocean to the north and west, the Southern Ocean to th ...
has the most restrictive regulations on electronic gaming machines in general, with the
Crown Perth
Crown Perth (formerly Burswood Island Casino, Burswood Island Complex and
Burswood Entertainment Complex) is a resort and casino located in Burswood, Western Australia, near the Swan River. The resort consists of a casino, a convention centre ...
casino resort being the only venue allowed to operate them,
and banning slot machines with spinning reels entirely. This policy had an extensive political history, reaffirmed by the 1974 Royal Commission into Gambling:
While Western Australian gaming machines are similar to the other states', they do not have spinning reels. Therefore, different animations are used in place of the spinning reels in order to display each game result.
Nick Xenophon
Nick Xenophon ( Nicholas Xenophou; born 29 January 1959) is an Australian politician and lawyer who was a Senator for South Australia from 2008 to 2017. He was the leader of two political parties: Nick Xenophon Team federally, and Nick Xenophon ...
was elected on an independent
No Pokies
No Pokies was an independent South Australian Legislative Council ticket that ran upper house candidates at the 1997, 2002 and 2006 state elections. Poker machines or "pokies" are the Australian version of slot machines. It was replaced by the Ni ...
ticket in the
South Australian Legislative Council
The Legislative Council, or upper house, is one of the two chambers of the Parliament of South Australia. Its central purpose is to act as a house of review for legislation passed through the lower house, the House of Assembly. It sits in Parli ...
at the
1997 South Australian state election on 2.9 percent, re-elected at the
2006 election on 20.5 percent, and elected to the
Australian Senate
The Senate is the upper house of the Bicameralism, bicameral Parliament of Australia, the lower house being the House of Representatives (Australia), House of Representatives. The composition and powers of the Senate are established in Chapter ...
at the
2007 federal election on 14.8 percent. Independent candidate
Andrew Wilkie
Andrew Damien Wilkie (born 8 November 1961) is an Australian politician and independent federal member for Clark. Before entering politics Wilkie was an infantry officer in the Australian Army., Australian Parliament House Biographies; 19 Augu ...
, an anti-pokies campaigner, was elected to the
Australian House of Representatives
The House of Representatives is the lower house of the bicameral Parliament of Australia, the upper house being the Senate. Its composition and powers are established in Chapter I of the Constitution of Australia.
The term of members of the ...
seat of
Denison at the
2010 federal election. Wilkie was one of four crossbenchers who supported the
Gillard Labor
Labour or labor may refer to:
* Childbirth, the delivery of a baby
* Labour (human activity), or work
** Manual labour, physical work
** Wage labour, a socioeconomic relationship between a worker and an employer
** Organized labour and the la ...
government following the
hung parliament
A hung parliament is a term used in legislatures primarily under the Westminster system to describe a situation in which no single political party or pre-existing coalition (also known as an alliance or bloc) has an absolute majority of legisl ...
result. Wilkie immediately began forging ties with Xenophon as soon as it was apparent that he was elected. In exchange for Wilkie's support, the Labor government are attempting to implement
precommitment technology for high-bet/high-intensity poker machines, against opposition from the
Tony Abbott
Anthony John Abbott (; born 4 November 1957) is a former Australian politician who served as the 28th prime minister of Australia from 2013 to 2015. He held office as the leader of the Liberal Party of Australia.
Abbott was born in Londo ...
Coalition
A coalition is a group formed when two or more people or groups temporarily work together to achieve a common goal. The term is most frequently used to denote a formation of power in political or economical spaces.
Formation
According to ''A Gui ...
and Clubs Australia.
During the
COVID-19
Coronavirus disease 2019 (COVID-19) is a contagious disease caused by a virus, the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The first known case was COVID-19 pandemic in Hubei, identified in Wuhan, China, in December ...
pandemic of 2020, every establishment in the country that facilitated poker machines was shut down, in an attempt to curb the spread of the virus, bringing Australia's usage of poker machines effectively to zero.
Russia
In Russia, "slot clubs" appeared quite late, only in 1992. Before 1992, slot machines were only in casinos and small shops, but later slot clubs began appearing all over the country. The most popular and numerous were "Vulcan 777" and "Taj Mahal". Since 2009, when gambling establishments were banned, almost all slot clubs disappeared and are found only in a specially authorized gambling zones.
United Kingdom
Slot machines are covered by the
Gambling Act 2005
The Gambling Act 2005 (2005 c 19) is an Act of the Parliament of the United Kingdom. It mainly applies to England and Wales, and to Scotland, and is designed to control all forms of gambling. It transfers authority for licensing gambling from t ...
, which superseded the
Gaming Act 1968
Gaming may refer to:
Games and sports
The act of playing games, as in:
* Legalized gambling, playing games of chance for money, often referred to in law as "gaming"
* Playing a role-playing game, in which players assume fictional roles
* Playin ...
.
Slot machines in the U.K. are categorised by definitions produced by the
Gambling Commission
The Gambling Commission is an executive non-departmental public body of the Government of the United Kingdom responsible for regulating gambling and supervising gaming law in Great Britain. Its remit covers arcades, betting, bingo, casinos, ...
as part of the Gambling Act of 2005.
Casinos built under the provisions of the 1968 Act are allowed to house either up to twenty machines of categories B–D or any number of C–D machines. As defined by the 2005 Act, large casinos can have a maximum of one hundred and fifty machines in any combination of categories B–D (subject to a machine-to-table ratio of 5:1); small casinos can have a maximum of eighty machines in any combination of categories B–D (subject to a machine-to-table ratio of 2:1).
Category A
Category A games were defined in preparation for the planned "
Super Casinos". Despite a lengthy bidding process with
Manchester
Manchester () is a city in Greater Manchester, England. It had a population of 552,000 in 2021. It is bordered by the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The t ...
being chosen as the single planned location, the development was cancelled soon after
Gordon Brown
James Gordon Brown (born 20 February 1951) is a British former politician who served as Prime Minister of the United Kingdom and Leader of the Labour Party (UK), Leader of the Labour Party from 2007 to 2010. He previously served as Chance ...
became
Prime Minister of the United Kingdom
The prime minister of the United Kingdom is the head of government of the United Kingdom. The prime minister advises the sovereign on the exercise of much of the royal prerogative, chairs the Cabinet and selects its ministers. As modern pr ...
. As a result, there are no lawful Category A games in the U.K.
Category B
Category B games are divided into subcategories. The differences between B1, B3 and B4 games are mainly the stake and prizes as defined in the above table. Category B2 games –
Fixed odds betting terminal
A fixed odds betting terminal (FOBT, sometimes pronounced "fob-tee") is a type of electronic slot machine normally found in betting shops in the United Kingdom and introduced in 1999. The terminals allow players to bet on the outcome of various ...
s (FOBTs) – have quite different stake and prize rules: FOBTs are mainly found in licensed
betting shop
In the United Kingdom, Ireland, Australia and New Zealand, a betting shop is a shop away from a racecourse ("off-course") where one can legally place bets in person with a licensed bookmaker. Most shops are part of chains including William Hill, ...
s, or bookmakers, usually in the form of electronic
roulette
Roulette is a casino game named after the French word meaning ''little wheel'' which was likely developed from the Italian game Biribi''.'' In the game, a player may choose to place a bet on a single number, various groupings of numbers, the ...
.
The games are based on a
random number generator
Random number generation is a process by which, often by means of a random number generator (RNG), a sequence of numbers or symbols that cannot be reasonably predicted better than by random chance is generated. This means that the particular out ...
; thus each game's probability of getting the jackpot is independent of any other game: probabilities are all equal. If a
pseudorandom number generator
A pseudorandom number generator (PRNG), also known as a deterministic random bit generator (DRBG), is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers. The PRNG-generate ...
is used instead of a truly random one, probabilities are not independent since each number is determined at least in part by the one generated before it.
Category C
Category C games are often referred to as fruit machines, one-armed bandits and AWP (
amusement with prize Amusement with prize or amusement with prizes (AWP) are slot machines that provide some level of player interaction. They do not, however, depend on the skill of the player; machines that depend on player skill are called skill with prize (SWP) mac ...
). Fruit machines are commonly found in
pub
A pub (short for public house) is a kind of drinking establishment which is licensed to serve alcoholic drinks for consumption on the premises. The term ''public house'' first appeared in the United Kingdom in late 17th century, and was ...
s,
club
Club may refer to:
Arts, entertainment, and media
* ''Club'' (magazine)
* Club, a '' Yie Ar Kung-Fu'' character
* Clubs (suit), a suit of playing cards
* Club music
* "Club", by Kelsea Ballerini from the album ''kelsea''
Brands and enterprises ...
s, and
arcade
Arcade most often refers to:
* Arcade game, a coin-operated game machine
** Arcade cabinet, housing which holds an arcade game's hardware
** Arcade system board, a standardized printed circuit board
* Amusement arcade, a place with arcade games
* ...
s. Machines commonly have three but can be found with four or five reels, each with 16–24 symbols printed around them. The reels are spun each play, from which the appearance of particular combinations of symbols result in payment of their associated winnings by the machine (or alternatively initiation of a subgame). These games often have many extra features, trails and subgames with opportunities to win money; usually more than can be won from just the payouts on the reel combinations.
Fruit machines in the U.K. almost universally have the following features, generally selected at random using a
pseudorandom number generator
A pseudorandom number generator (PRNG), also known as a deterministic random bit generator (DRBG), is an algorithm for generating a sequence of numbers whose properties approximate the properties of sequences of random numbers. The PRNG-generate ...
:
* A player (known in the industry as a ''punter'') may be given the opportunity to ''hold'' one or more reels before spinning, meaning they will not be spun but instead retain their displayed symbols yet otherwise count normally for that play. This can sometimes increase the chance of winning, especially if two or more reels are held.
* A player may also be given a number of ''nudges'' following a spin (or, in some machines, as a result in a subgame). A nudge is a step rotation of a reel chosen by the player (the machine may not allow all reels to be nudged for a particular play).
* ''Cheats'' can also be made available on the internet or through emailed newsletters to subscribers. These cheats give the player the impression of an advantage, whereas in reality the payout percentage remains exactly the same. The most widely used cheat is known as hold after a nudge and increases the chance that the player will win following an unsuccessful nudge. Machines from the early 1990s did not advertise the concept of hold after a nudge when this feature was first introduced, it became so well known amongst players and widespread amongst new machine releases that it is now well-advertised on the machine during play. This is characterized by messages on the display such as ''DON'T HOLD ANY'' or ''LET 'EM SPIN'' and is a designed feature of the machine, not a cheat at all. Holding the same pair three times on three consecutive spins also gives a guaranteed win on most machines that offer holds.
It is known for machines to pay out multiple jackpots, one after the other (this is known as a "repeat") but each jackpot requires a new game to be played so as not to violate the law about the maximum payout on a single play. Typically this involves the player only pressing the Start button at the "repeat" prompt, for which a single credit is taken, regardless of whether this causes the reels to spin or not. Machines are also known to intentionally set aside money, which is later awarded in a series of wins, known as a "streak". The minimum payout percentage is 70%, with pubs often setting the payout at around 78%.
Japan
Japanese slot machines, known as or pachislot from the words "pachinko" and "slot machine", are a descendant of the traditional Japanese
pachinko
is a mechanical game originating in Japan that is used as an arcade game, and much more frequently for gambling. Pachinko fills a niche in Japanese gambling comparable to that of the slot machine in the West as a form of low-stakes, low-st ...
game. Slot machines are a fairly new phenomenon and they can be found mostly in pachinko parlors and the adult sections of
amusement arcades, known as game centers.
The machines are regulated with
integrated circuit
An integrated circuit or monolithic integrated circuit (also referred to as an IC, a chip, or a microchip) is a set of electronic circuits on one small flat piece (or "chip") of semiconductor material, usually silicon. Large numbers of tiny ...
s, and have six different levels changing the odds of a
777
777 may refer to:
* 777 (number), a number
* AD 777, a year of the Julian calendar
* 777 BC, a year in the 8th century BC
* Boeing 777, a commercial jet airliner
:* Boeing 777X, the newer generation of the Boeing 777.
Art and entertainment Alb ...
. The levels provide a rough outcome of between 90% to 160% (200% for skilled players). Japanese slot machines are "beatable". Parlor operators naturally set most machines to simply collect money, but intentionally place a few paying machines on the floor so that there will be at least someone winning, encouraging players on the losing machines to keep gambling, using the psychology of the
gambler's fallacy.
Despite the many varieties of pachislot machines, there are certain rules and regulations put forward by the , an affiliate of the
National Police Agency National Police may refer to the national police forces of several countries:
*Afghanistan: Afghan National Police
*Haiti: Haitian National Police
*Colombia: National Police of Colombia
*Cuba: Cuban National Police
*East Timor: National Police of E ...
. For example, there must be three reels. All reels must be accompanied by buttons which allow players to manually stop them, reels may not spin faster than 80 RPM, and reels must stop within 0.19 seconds of a button press. In practice, this means that machines cannot let reels slip more than 4 symbols. Other rules include a 15 coin payout cap, a 50 credit cap on machines, a 3 coin maximum bet, and other such regulations.
Although a 15 coin payout may seem quite low, regulations allow "Big Bonus" (c. 400–711 coins) and "Regular Bonus" modes (c. 110 coins) where these 15 coin payouts occur nearly continuously until the bonus mode is finished. While the machine is in bonus mode, the player is entertained with special winning scenes on the LCD display, and energizing music is heard, payout after payout.
Three other unique features of Pachisuro machines are "stock", "renchan", and . On many machines, when enough money to afford a bonus is taken in, the bonus is not immediately awarded. Typically the game merely stops making the reels slip off the bonus symbols for a few games. If the player fails to hit the bonus during these "standby games", it is added to the "stock" for later collection. Many current games, after finishing a bonus round, set the probability to release additional stock (gained from earlier players failing to get a bonus last time the machine stopped making the reels slip for a bit) very high for the first few games. As a result, a lucky player may get to play several bonus rounds in a row (a "renchan"), making payouts of 5,000 or even 10,000 coins possible. The lure of "stock" waiting in the machine, and the possibility of "renchan" tease the gambler to keep feeding the machine. To tease them further, there is a ''tenjō'' (ceiling), a maximum limit on the number of games between "stock" release. For example, if the ''tenjō'' is 1,500, and the number of games played since the last bonus is 1,490, the player is guaranteed to release a bonus within just 10 games.
Because of the "stock", "renchan", and ''tenjō'' systems, it is possible to make money by simply playing machines on which someone has just lost a huge amount of money. This is called being a "
hyena
Hyenas, or hyaenas (from Ancient Greek , ), are feliform carnivoran mammals of the family Hyaenidae . With only four extant species (each in its own genus), it is the fifth-smallest family in the Carnivora and one of the smallest in the clas ...
". They are easy to recognize, roaming the aisles for a "kamo" ("
sucker
Sucker may refer to:
General use
* Lollipop or sucker, a type of confection
* Sucker (slang), a slang term for a very gullible person
* Hard candy
** Cough drop
** Mint (candy)
Biology
* Sucker (botany), a term for a shoot that arises undergro ...
" in English) to leave his machine.
In short, the regulations allowing "stock", "renchan", and ''tenjō'' transformed the pachisuro from a low-stakes form of entertainment just a few years back to hardcore gambling.
Many people may be gambling more than they can afford, and the big payouts also lure unsavory "hyena" types into the gambling halls.
To address these social issues, a new regulation (Version 5.0) was adopted in 2006 which caps the maximum amount of "stock" a machine can hold to around 2,000–3,000 coins' worth of bonus games. Moreover, all pachisuro machines must be re-evaluated for regulation compliance every three years. Version 4.0 came out in 2004, so that means all those machines with the up to 10,000 coin payouts will be removed from service by 2007.
Jackpot disputes
Electronic slot machines can malfunction. When the displayed amount is smaller than the one it is supposed to be, the error usually goes unnoticed. When it happens the other way, disputes are likely. Below are some notable arguments caused by the owners of the machines saying that the displayed amounts were far larger than the ones patrons should get.
United States of America
Two such cases occurred in casinos in Colorado in 2010, where
software errors led to indicated jackpots of $11 million and $42 million. Analysis of machine records by the state Gaming Commission revealed faults, with the true jackpot being substantially smaller. State gaming laws did not require a casino to honour payouts in that case.
Vietnam
On October 25, 2009, while a Vietnamese American man, Ly Sam, was playing a slot machine in the Palazzo Club at the Sheraton Saigon Hotel in Ho Chi Minh City, Vietnam, it displayed that he had hit a jackpot of US$55,542,296.73. The casino refused to pay, saying it was a machine error, Mr Ly sued the casino. On January 7, 2013, the District 1 People's Court in Ho Chi Minh City decided that the casino had to pay the amount Mr Ly claimed in full, not trusting the error report from an inspection company hired by the casino. Both sides appealed thereafter, and Mr Ly asked for interest while the casino refused to pay him. In January, 2014, the news reported that the case had been settled out of court, and Mr Ly had received an undisclosed sum.
Problem gambling and slot machines
![Mills Novelty Co](https://upload.wikimedia.org/wikipedia/commons/d/d2/Mills_Novelty_Co._Horse_Head_Bonus_Antique_Slot_Machine.jpg)
Natasha Dow Schüll, associate professor in
New York University
New York University (NYU) is a private research university in New York City. Chartered in 1831 by the New York State Legislature, NYU was founded by a group of New Yorkers led by then-Secretary of the Treasury Albert Gallatin.
In 1832, the ...
's Department of Media, Culture and Communication, uses the term "machine zone" to describe the state of immersion that users of slot machines experience when gambling, where they lose a sense of time, space, bodily awareness, and monetary value.
Mike Dixon, PhD, professor of psychology at the
University of Waterloo
The University of Waterloo (UWaterloo, UW, or Waterloo) is a public research university with a main campus in Waterloo, Ontario
Waterloo is a city in the Canadian province of Ontario. It is one of three cities in the Regional Municipality ...
, studies the relationship between slot players and machines. In one of Dixon's studies, players were observed experiencing heightened arousal from the
sensory stimulus coming from the machines. They "sought to show that these 'losses disguised as wins' (LDWs) would be as arousing as wins, and more arousing than regular losses."
Psychologists Robert Breen and Marc Zimmerman found that players of video slot machines reach a debilitating level of involvement with gambling three times as rapidly as those who play traditional casino games, even if they have engaged in other forms of gambling without problems.
Eye-tracking research in local bookkeepers' offices in the UK suggested that, in slots games, the reels dominated players' visual attention, and that problem gamblers looked more frequently at amount-won messages than did those without gambling problems.
The 2011 ''
60 Minutes
''60 Minutes'' is an American television news magazine broadcast on the CBS television network. Debuting in 1968, the program was created by Don Hewitt and Bill Leonard, who chose to set it apart from other news programs by using a unique styl ...
'' report "Slot Machines: The Big Gamble"
focused on the link between slot machines and gambling addiction.
See also
*
Casino
A casino is a facility for certain types of gambling. Casinos are often built near or combined with hotels, resorts, restaurants, retail shopping, cruise ships, and other tourist attractions. Some casinos are also known for hosting live entertai ...
*
European Gaming & Amusement Federation
*
List of probability topics
This is a list of probability topics, by Wikipedia page.
It overlaps with the (alphabetical) list of statistical topics. There are also the outline of probability and catalog of articles in probability theory. For distributions, see List of pro ...
*
Multi-armed bandit
In probability theory and machine learning, the multi-armed bandit problem (sometimes called the ''K''- or ''N''-armed bandit problem) is a problem in which a fixed limited set of resources must be allocated between competing (alternative) choices ...
*
Pachinko
is a mechanical game originating in Japan that is used as an arcade game, and much more frequently for gambling. Pachinko fills a niche in Japanese gambling comparable to that of the slot machine in the West as a form of low-stakes, low-st ...
*
Problem gambling
Problem gambling or ludomania is repetitive gambling behavior despite harm and negative consequences. Problem gambling may be diagnosed as a mental disorder according to ''DSM-5'' if certain diagnostic criteria are met. Pathological gambling is ...
*
Progressive jackpot
A progressive jackpot is a jackpot (a gambling grand prize or payout) which increases each time the game is played but the jackpot is ''not'' won. When the progressive jackpot is won, the jackpot for the next play is reset to a predetermined value ...
*
Quiz machine
Quiz machine is a term used in the UK for commercial coin-operated video quiz games that offer cash prizes for winning performances. These machines are usually found sited in pubs, bars and other places of entertainment. The term quiz machine is o ...
*
United States state slot machine ownership regulations
*
Video bingo
*
Video lottery terminal
A video lottery terminal (VLT), also sometimes known as a video gaming terminal (VGT), video slots, or the video lottery, is a type of electronic gambling machine. They are typically operated by a region's lottery, and situated at licensed establis ...
(VLT)
*
Video poker
Video poker is a casino game based on five-card draw poker. It is played on a computerized console similar in size to a slot machine.
History
Video poker first became commercially viable when it became economical to combine a television-like mo ...
References
Bibliography
*Brisman, Andrew. ''The American Mensa Guide to Casino Gambling: Winning Ways'' (Stirling, 1999)
*Grochowski, John. ''The Slot Machine Answer Book: How They Work, How They've Changed, and How to Overcome the House Advantage'' (Bonus Books, 2005)
*Legato, Frank. ''How to Win Millions Playing Slot Machines! ...Or Lose Trying'' (Bonus Books, 2004)
External links
{{DEFAULTSORT:Slot Machine
American inventions
Arcade games
Gaming devices
Commercial machines
Gambling games